The genetic code is said to be 'degenerate' because: MCQ with Answer and Explanation

Question
The genetic code is said to be 'degenerate' because:
A. Some codons code for more than one amino acid
B. More than one codon can code for the same amino acid
C. One amino acid is coded by only one codon
D. The code is not universal
Answer: Option B
Solution (By JKExamLibrary)
The degeneracy of the genetic code refers to the fact that most amino acids are specified by more than one codon. For example, leucine is coded by six different codons (UUA, UUG, CUU, CUC, CUA, CUG). This redundancy is primarily due to the 'wobble' hypothesis, where the third base of the codon can have non-standard base pairing with the first base of the anticodon, allowing a single tRNA to recognize multiple codons.
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Question #1
The process by which nitrogen gas is converted to ammonia by bacteria is called:
A. Nitrification
B. Denitrification
C. Nitrogen fixation
D. Ammonification
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Correct Answer: Option C

Explanation:
Biological nitrogen fixation, carried out by symbiotic (Rhizobium) and free-living (Azotobacter) bacteria, reduces atmospheric N₂ to ammonia. Nitrification converts ammonia to nitrates, denitrification returns N₂ to air, ammonification releases ammonia from organic matter.
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Question #2
The deficiency of iodine in the diet leads to:
A. Goiter
B. Anemia
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Correct Answer: Option A

Explanation:
Iodine is essential for synthesis of thyroxine (T₄) and triiodothyronine (T₃). Deficiency leads to enlargement of the thyroid gland, known as goiter, as the gland tries to compensate. Anemia is due to iron deficiency, rickets to vitamin D deficiency, scurvy to vitamin C deficiency. Iodized salt is a public health measure to prevent goiter.
This question belongs to: Science Biology
Question #3
The organism that causes sleeping sickness is transmitted by:
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Correct Answer: Option B

Explanation:
African sleeping sickness (trypanosomiasis) is caused by Trypanosoma brucei and transmitted by the bite of the tsetse fly (Glossina). Malaria is by mosquito, typhoid by housefly (mechanical), Lyme disease by tick.
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